slippyr4 wrote:
> Are you using one of these?
>  =20
>> http://www.allegromicro.com/en/Products/Categories/Sensors/ats.asp
>>
>>
>>    =20
> Yes, ATS642. I made a tiny little potted board with a load resistor and a
> comparator on it.
>
> The target is indeed an ABS reluctor ring. The tooth-gap spacing is prett=
y
> close to 50:50, as far as I can tell.
>
> My single channel solution has been in use for some time now and has prov=
en
> to work very well. I just wondered if adding a second one (in the right
> place, and that might be tough to do) would give me the directionality th=
at
> grey code provides.
>  =20
Shouldn't be that tough to do.  The second sensor can be anywhere around=20
the wheel, as long as it is in the middle of a tooth (or gap) when the=20
first one is right on the edge of a tooth (or gap).  And it doesn't need=20
to be perfect, although the closer it is, the faster the gear can turn=20
without losing counts.

I haven't actually used the sensors in question, but I built the=20
machines that test them.

Kerry

--=20
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